With the media environment breaking into thousands of tiny subcultures, there are hugely popular genres that are essentially invisible to people sitting right next to fans.
If you don't listen to Kawaii Metal, Vaporwave or Pirate Metal, those genres might sound like a bit on 30 Rock.
Since we're not all listening to the same handful of stations -- specialization has been underway since the 1960s and went into turbodrive in the digital era -- "well known" is a pretty high bar.
And if you spend any time on social media, you'll see people claiming to not know the names of huge pop stars like Sabrina Carpenter, who are still played by the radio 24/7.